WASHINGTON — Republican opposition to the GOP health care bill swelled to near-fatal numbers Sunday as Sen. Susan Collins all but closed the door on supporting the last-ditch effort to scrap the Obama health care law and Sen. Ted Cruz said that “right now” he doesn’t back it.

In a late bid to win votes and stave off defeat, Republicans were adding $14.5 billion to the measure for states, according to documents obtained late Sunday by The Associated Press.